Grinding-machine.



No. 389,555. i PATENTED JUNE 2, 1908.

GQ M. STEDMAN. @BINDING MACHINE.

ABPLIOATION FILED JULY 3. 1907.

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GEORGE M. STEDMAN, OF AURORA, INDIANA.

GRINDIN (Fr-MACHINE Specification of Letters Patent.

Application filed July 3, 1907.

Patented .Tune 2, 1908.

Serial No. 381,987.

To all whom 'it-may camera:

Be it known that I, GEORGE M. STEDMAN,

` a citizen of the United States, residing at Aurora, in the county ofDearborn and State of Indiana, have invented certain new and usefulImprovements in Grinding-Machines, of which the following is aspecification.

My invention relates to grinding, crushing or pulverizing machines, suchas are used, for example, to pulverize fertilizer material, such asbones, tankage, lime, clay, etc., and consists more particularly incertain improvements in said class of machines, whereby their efficiencyand durability are enhanced. j

My invention is applicable to machines which have a series of rotatingblades ,rigidly secured to the carrying-shaft, and also to machines ofthe hammer type, in which the blades are loosely pivoted to theircarrying member, and are thrown out into their operative position bycentrifugal force.

The invention is illustrated in the accompanying three sheets ofdrawings, in which,

Figure 1 is a top plan view of my improvements applied to a crushing orgrinding machine, of the rigid blade type, the casing and a portion ofthe mechanism being shown in section; Fig. 2 is a side elevation of thesame machine, the casing and shafts being shown in section: Fig. 8 is aview similar to Fig. 1 of a machine of the hammer type, having myinvention applied thereto, and, Fig. 4 is aview, similar to Fig. 2 ofthe machine shown in Fig. 3. l

The machines in both cases comprise a rotating shaft 1, driven, forexample, from the pulley 2 and mounted in journal bearings 3, 3. Inside.said bearings, the shaft 1 passes transversely through the casing 4,which, as shown, is a rectangular metal box, having a hopper, orinlet-spout 5 in its top and an inclined wall 6 at one end.

In the machine of Figs. 1 and 2 there are keyed to the shaft 1 a seriesof cast-iron disks 7, between each pair of which are mounted a plurality(in the drawings four are shown) of radially extending arms or blades 8,the disks and blades, being securely clamped together by the bolts 9. j

In the form illustrated in Figs. 3 and 4, the blades 8a are looselypivoted upon the bolts 9, which pass through the series of disks 7 abetween each pair of which the blades swing on said bolts, and arethrown out into radial position by centrifugal force, when the shaft isrotated this is a well known construction in the art, and is shown heremerely to illustrate the applicability of my invention to that form ofmachine.

In operation, the blades 8 pass between a series of relativelystationary arms or blades 12, which are secured by a bolt 13 in socketsin a cast-iron member 14, provided with ears 15, keyed to a shaft 16,which passes transversely through slots in the casing 4 and is journaled in bearings 17, adj ustable longitudinally of the machine byset-screws 18 and secured in adjusted position by bolts 19 passv ingthrough slots in the bearings. To the upper side of the member 14, overthe ends of the blades 12, is secured a flat knife 20, the edge of whichextends nearly to the periphery of the circle in which the ends of theblades 8 travel. By loosening the holdingdown bolts, 19, of the bearings17, the position thereof, and consequently of the knife 20, canbeadjusted as desired by the set screws 18, as will be obvious.. Outsideone of the walls of the casing 4, the shaft 16 carries an arm 22, whichextends rearwardly and has its end normally in engagement with theunderside of a pin 23, made of wood or other breakable material, andheld in ears 24 formed on a bracket 25, projecting from the base Tof thecasing. r

In operation, the knife 20 and blades 12 cooperate with the travelingblades 8 to break, cut up and pulverize the'material fed into the casingthrough hopper 5, and should a piece of iron or other over-hard materialcome between the blades, the pin 23 will be broken, releasing arm 22,which lflies upward, blades 12 and knife 18 being consequently free tofall down, thus preventing any breaking of or damage to the grindingparts.

Having thus described my invention, what I claim is- 1. In a machine ofthe class described, a series of revolving blades, a coperating seriesof relatively stationary blades, a knife secured immediately above saidstationary blades with its edge adjacent to the path of travel of theends of said revolving blades, means to adjust said knife and stationaryblades towards and away from said revolving blades, and means toyieldingly hold said knife and stationary blades in operative position.

2. In a machine of the class described, a rotating shaft, a series ofdisks secured there- `said second shaft towards and away from JOHN DEAN.

said rotating shaft, and breakable means to 10 normally hold said secondshaft from turnoted between each pair of said disks7 a second shaftparallel to said rotating shaft, a series of relatively stationaryblades secured therein to and projecting between the paths of travel flutestimony whereof I have affixed my of said hammer blades, a knifesecured immesignature, in presence of two Witnesses. diately above saidstationary blades with its GEORGE M. STEDMAN v edge adjacent to thepathsof travel of the Witnesses: ends of said hammer blades, means to adjustSILAs D. DEAN,

